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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '49faa98e9d2d3620a5fb5e84c2fb9b406b2e02a223bce1810527dfb3cd8125b2' 
  AND token = '43fZkT/DXupirNu1eAMdEHbTDqwsusLKTFvcLPyemAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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