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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90d165c0be98d92673aa61aaed652d08f304d670938b7767cccbf85bfafd0a99' 
  AND token = '2/M3hs0Vvdo7RaiTyA4VR+TyW7BWS2YKXmUf8dLNMsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}