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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3efd88675a158e453647390fa1dc1a220d7420594727077193dd27e422051b3a' 
  AND token = '6t1ZzerQnNvtBu00NlzU5G/Q5IZ5d2xjY8CBelFGStM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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