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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5be00871d0ee0e52500eecd9057f59ebf6e9399d2c186192a42462db50eebe17' 
  AND token = '5hj2UFjBDqxoz2kuf8yLXqE0LCSuFwV40J4+kHdiQnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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