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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f6bbc210231c4cd8888f2897582a91c8bf719650abb0e9862b5182110827aa93' 
  AND token = 'gcf/Ihsh4/K50gbjFTj/Oz5x9uEbT2MagunjyT1smFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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