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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '108d8639525a38aa04b3761ddd65dd55cebfa485b55773c2a956cee8e4fc1c0d' 
  AND token = 'BSv3MmXspgslAYvWejlWIt1FVjADQS3aE8V3dtd54fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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