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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c95c6f58539bae77ff27af5a70e26f3aa6f4591a13fd5689fbed19036b15beb6' 
  AND token = 'lbyR/3t5+vt+eA+x3rW41ty5Yli/o38pqCjnx9ehEps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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