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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99178398f8867c19560eb088cf167ec17b3893f50cffce13bee227b09b73e0f3' 
  AND token = '8XGvrErCxIBkZp0iG0S+SuhnNiH/0mvBuShB3y/jpZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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