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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0be3ddfdda5a40436e8b81dc9260ccaf1ec7cd4e9d0995af61d36aaabfd96dc3' 
  AND token = 'GGMPHDnsscR/npk5h5E9AWWw+dp42cQI6ODZ3IDbHBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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