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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93dce60c2636d5b4c0aea65de63a8f8301ffb1123bd9ff288a2aaa5415ecc2a4' 
  AND token = 'k7a6QO5SOtmknuHtm/e027Ae2kWnfoKPAkyEkAaw4j4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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