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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3bb8735ee7a58846c9e129c305322f9b6b7794ca749d0191b70fa2f2e7f2d36e' 
  AND token = 'N8uUy8IdNrUzIdLtdfFwIiAZtmZ1DnkFcZqUfTwHG3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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