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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '65c661f63cdd2b2d8088de153112d6c3eba510ed6e9ea98bad0909f18a636586' 
  AND token = '4jsZ4NWb6I9ccB5BN++qWCPUpgexFdhIpdov42HL8FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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