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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f758d6c91205e1cb9ae677b8c1e9426fdf761b14a0683ddd324e79280a618b88' 
  AND token = 'QMGvsgJwya62Kdz8lI7i2nOtay6xgsig/4cRFKt0OGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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