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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b44797c8a8cc5d26e7786d2e98a8dc06dd88fa0fcdd39cef50f21a2ab6eb9abb' 
  AND token = 'sbH+7Gvin6cwzMW7ctHWOEBq1D/SbWZvDJ5eC5kcxyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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