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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '396ba9e6e5e6cc4bfe94612c108e86117a7ea124b1bb26f8f105db6262e5b14c' 
  AND token = 'Nlb4jxj+F2v8pUw8eKqj0E4YEAoV0+pZWR+MTwK2yjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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