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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b65372758d72aa9959e638153defcbcba7e2e30d45984656f358b8a957045705' 
  AND token = 'OVD/rgLrfaUDsGByJQKAyJ6uTL2ppOK1EGdM785QdTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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