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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8299c3b4f957deb9d3e7e93776c2b3a802fed33651019d432196eaefab764676' 
  AND token = 'yYf5pEY1R3nN74cJPoxhOr2ynT7Lq2AwVQvrbjjz0Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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