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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '21bd0f260aba0e9e5bea414e2923af4caedd174db6d4a3f3486e72da2a2f88da' 
  AND token = 'Z1FWgx6lzZZtThMPxOwui2o50n3J6avGA1K9h1drMWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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