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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e556ac65781ad2cd53c9697a95694d719a312e39e4fcbce36629ef547cc5a76' 
  AND token = 'H3t6iKGSgKxvuvFJmdmIXUiR8lTkv8wz5gfZCKMueiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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