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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '390ebbc2bc648546856b8241d1c4aaf03e6d2f990ba102e2d646d324381075d2' 
  AND token = 'e91X6heeVZJgPyNRYDUC3DCBLUjYM5m4LUn4KY5cPEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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