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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f07616dcd734523397bf7d2e1195a84a4856c7d31b07d90c9f15660ecaad440' 
  AND token = '4IKeKi0kith30dh7jL5/RU4B+cGJEAG9b8pBttqok6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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