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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2150adc33db566b9de0c34d8fa969be24987c262731bf1d05e879c2ffe651625' 
  AND token = '4pNr16RnLgSZZiltPMbuo3wolZEj2hiSeI1XSkeFr0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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