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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1694c1873b2b1c91be9b4edd17f278cbf1be3ebdeab689707cee5b2e6a0d6310' 
  AND token = '+XKuz6ouIhz3N+Hayf21MtrjS9V2cm58QXS8VcWtAAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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