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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf70fc3c222a253a77192015f23bb4e68f1cdbec2fe6b012be729285e05b5547' 
  AND token = 'mRl9ju36ISdsGzu3PeS+T4uyzqKNeHYpM3f2TI+kvsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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