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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2fb296abb1459d8d12cf126dc5ff2d5b26e2176852b0ebd6d8dbea50c3c4e0b' 
  AND token = 'amupRYkotYBOHr54OiSgEiqke69oJKJjwT7G3jlxgSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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