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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4d39f69203ad14548995199574ea4293e0463064e3ad3d2ba3890775464c38b' 
  AND token = 'DxhE7rQylVltd+owE1V1n6tx1lW8UuSTEtjDYOi3RY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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