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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62e369cbd9ca0057a0818132785134c203316deea1f213e044455b7dd853781f' 
  AND token = 'fQZCSdC5yQ/Pzl61Sn0ApvBI6Am1GUg3VLfOadQgdNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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