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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f1de3aba873087d7b323dd3d5420c409572970a6de02f6f0d6a0494a2547cc9' 
  AND token = 'ZS1HIJ5ewIVm71nhI6UMZi6YFlbIEC/u9heYJx3ebAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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