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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c73d3cfbf42179cc7626838bdac6cf6cb593d26778c770d43651cb7874fba56' 
  AND token = 'MURbXe3mWy1cHcjsTtkxkSg/5HIjX9+I2MB7xkFoLdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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