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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e91cd9f5c95ea2031bb50ced0aad6a89225dfa5eac4136229797a0f86e60e367' 
  AND token = 'GWtDAdnSsi3LugBivpisBqJBqwrV1XN68U9YiZ3cdGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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