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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a46eff941ef057328b5922002fa28ccd43b62f176c1c787b37a142afcfecde70' 
  AND token = 'zHS4kYxGWFrmfEkJdEbLZW4VABllI8O7fTPexNKn6GM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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