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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '895b2043c4ce8856e85a134aa15d0903fe6f9e2b77bbe89adb0d5871b0e9a0a6' 
  AND token = 'C2Fx7O2d5q8Vu+wF/inV86IUrdLgMDqTPMZeknMRxfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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