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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2955f576346272dd988dd55ee1143fefb31abd534aa67104e23397e857646966' 
  AND token = '0ehKdHuRthneIGnaWLrbXrtKmAgaIM2tmrbFSbZVSS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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