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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2109483a780fc1518dd5c9175276a122ad1a0baa8dd390116a58811e5b75807d' 
  AND token = 'r3tau6OudmjuAttdU/ccZATKkPWghEdHIU7m72Vue/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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