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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d058ffb5294cb86ba9e6cf27e7cef5fe6d1a29f9ed2085727e02c5aab555dac' 
  AND token = 'KdAgTvb//kMx1N3s7NfDuHnS+NM61elf3Un2P3FfHsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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