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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6351b3ad0c672c40784c0ffbd67bacf7203d98981352515507cdeaa30afd6590' 
  AND token = 'K7a0waUv55ioQqCsZHHpgJRhxuo7zM3dusTA4eF1654=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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