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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '325087ffae5447d2ed7e57a80d25d03ec17a02909727c5739b49a91d84d46f10' 
  AND token = 'P+ADpqt80tR3hVFPz2SVHwbwRUb18rXXffIMar50Kcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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