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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d8e38b7aee0fe74f7b7f5efe0210f07e8ec17f0c899d18998dee0065f69af82' 
  AND token = 'QcmBCLqO5vWKX12yyEevUmGY5BSHw123jKMkBaN3aMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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