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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f5f125638f7f23befc76ffdc2e3ba65893d4a6ac22cce38a4f53e2fdce53b92' 
  AND token = 'r8CTBBva+sMB3MObg2jcTXak2cI8OEXz8I8f6c9426M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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