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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a94671c97ed6b2e82960fc5822d534d8ec175b988d971d6c33b8113dc7c2a0b' 
  AND token = 'qBEXfgvuftAnCVA1zgev8rTd52e8cL1F8RpvTw4OAx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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