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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f41a7f007ec0ab60d8ba0fbcfdfdac99df77b62ad3b8a337e98a13989eca3aa' 
  AND token = 'EXsi9fO81DXkIxf2UHGHaqshoADtJI5VMX1wF4MkU2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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