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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc70c58d6328246100bb42a37043915476f13f4dc0ccb5582c8904228bd9e6c4' 
  AND token = 'X4R18BU1CmOyRyMPXDd737A2B3cqk+q7jcdeY8qKS7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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