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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90708ae412daf445923c98d5b151b55085a5c02553008e6b01c2baf9dedec177' 
  AND token = 'KJ+MFBBQS9V+Pg857Ps06AIf6XII4S0gFpQ7MkGHQL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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