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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a50a9a59bd815be05a3d6b79e621f677cb10177d6933e187df5726137f49d7f5' 
  AND token = 'piWxLNufnyu0/lmINf2nVBmusy+X4PFPf8QvTs1PP/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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