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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2a8b17a54daec97308989e8add677b1157a485fb5b512919ec3bbdbb56380ab' 
  AND token = 'G88+wTsa65/M2FNCD4Pb0PPPCJ7U+kQSNNK/N4gxdkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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