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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d79fa4ab2725bc7a87e430ec4019d198a91c43d52a74d452005aa076cb0fcb9' 
  AND token = 'I1iun3WiTWXC/WEG0l3p7si88lp4w2MZrx7Ls9PIZSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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