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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9282f6b38cd583fa602ba09a92ecfd55df4ba72ec0bb44e7dafd7f203c32295' 
  AND token = 'e/qyqeZ4VbR4DYztvSiI9uFzUYWRHL9nhDiLf3Dt/Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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