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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a63d31eb4f0ebfee703f7fdf817eaa3a991fd3ffb57a1a5119ddb3561ad280a3' 
  AND token = 'GFvU4E8LnHAVqF/SzTxqzgRyhP/Q6yhq1X4FIa1wCHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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