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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07a7bb10e6ed36cd434876f4bc26443cedbf3054b5020b1510c9b8183634b809' 
  AND token = '7z8C1ppI1IVO1Xw+5Rbz0se/Zoj2I5IsaKkZKcxHfF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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