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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c244e5e70a4e001c5711b7bbe1df0e2f8b1a05e4ab0e9dbce497b988550a0b8' 
  AND token = 'SlR1TNufu10gGdJSlINv6JzK4WrBlB7l1rtkgX/FXEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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