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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b1329f2df9db1c31908312a92fdffef9978a5e2ce74766e070b4882f17701fbe' 
  AND token = 'bsR2g4N0bA0ay1wCTnHu39kV0ShFXqbzp51ooGI2Dt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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