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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03993f0b00fcd561902f2cd551d822cde6f889b20c4758b8f3f48f903429a21d' 
  AND token = 'HS8IbaApApOKpEU52qnTdq7lgP0rTvkaueaB+S/Z75o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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