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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29f8e3887d52c61571767642b8330ddcbf473245c29ab5f4d31371926cc2d954' 
  AND token = 'OVy2xy/oiWFo7GcVAq4D1j4aXFTGWomRhS8PolKHN0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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