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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c4956ce6cb3d197aa5542df9dff742334c1195205e45094fffa426db1e31d51' 
  AND token = '4dPnPMPcQTFkZs+uvtCZ5WVWaVoImrWkdq795ry5QU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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