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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e55a1a0185fa03bbae6c625f3fdaebfe848c6d5c69cdcd009899ff5f574a0d2a' 
  AND token = 'uwHp6Ar/uZ5ZkBAD+1D4hZbwVvTCgxmaN0O35q/h2R0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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