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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2eff6b575db1d2a4e5411f4b26195ee110c55e83817a7d5a2dfd0347bd59a53b' 
  AND token = 'aOKtrC5ygsgKlN2Na7fC4/Jog3iMFWpfCCvNQFe85aI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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