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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa1e6f9224dc3429ac121ec5dec7e39448d95459b987cded3652936c1ed8c2df' 
  AND token = 'ka4mo/y2rZ9y7lLOG1ZHpdSdElmFDAGRu3DA+UxV/gA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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