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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5db322f43c59b97a8535b4aff43b0f0d94bbb9f067df325e7c0348e07fd3f852' 
  AND token = 'UMCVu925HHHJhKRYbjM2LA0WLPyT66Q67Sc3mkLEyk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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