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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e2ba4d0a989ecb5765288af43782a575d086bf4cc599ec6afb8b71b0315aa864' 
  AND token = 'LpCyD3UQR/qfMafbrQQSX22eCzjkN3sM1+eWAj8Ec30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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