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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'caa6652cdb9c9eaeb665b903d652ddcc761fefd8bead1769ccc5dc8fbe970c50' 
  AND token = 'HZIl1kKg9w0dfA7dcCDcNYL+bezbMdC4IeJD2/q4r2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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