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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a97d83018f2a1c44eab73051e49a5cde9a94876bd2148f088658575174fcf196' 
  AND token = 'wfQYnnEQWoeqD6qALcv9UOwrfQo7viFlfLAYVBSMTbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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