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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a01aef98775922fda9f78acc1e57a049ab1ff2a381b374cdd53f47a347ff9501' 
  AND token = '9FqIjMekJUyxHvXZkytQsKK2UDtnb8koVtsG0i2xHZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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